Qnx: Refactor BlackBerryConfiguration

Improve the NDK setting page to enable managing multiple NDKs.

* Refactor BlackBerryConfiguration to support multiple configurations
* Add auto detected kits for installed NDKs
* Add/Remove manual NDKs

Change-Id: Icbc850551da3f729ccaa3473da720ade3051adaf
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Wolfgang Bremer <wbremer@blackberry.com>